[Discussion] Resistance measurement circuit and judgment circuit

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[Discussion] Resistance measurement circuit and judgment circuit [Copy link]

Design a simple circuit.

Design requirements: resistance measurement circuit and judgment circuit.

Design purpose: detect whether the resistance of the circuit to be tested exceeds the preset value.

Design appearance: length (5cm, 8cm) width (0.5cm, 1cm)

Design ideas:

1. Resistance measurement circuit

1. Detection range R (20 ohms, 2M ohms)

2. Probe requirements: double probes, probe A is grounded, and probe B is a metal rod with adjustable length.

2. Judgment circuit

1. The set value is 3M ohms

2. Function: Determine the size of the measured value and the set value of the resistance detection circuit

3. Judgment result output: If the measured value is greater than the set value, there will be a signal output such as a sound signal light; if the measured value is less than the set value, there will be no signal output

4. Power supply: built-in dry battery (1.5V, 3V)